ORSPI4 datasheet(178/263 Pages) LATTICE

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ORCA ORSPI4 Data Sheet

178

SPI4 AC Timing

Supported Data Rates

The SPI4 interfaces (SPIA and SPIB) on the ORSPI4 device support the following data rates

Table 58. Supported Data Rates

1 SPI[A,B]_TREFCLK_x8 internal signal is used in quarter-rate mode

SPI4.2 Data Interface

System Timing Reference Points

Figure 90 shows the system timing reference points A and B for the data path timing parameters for both the trans-

mit interface and the receive interface.

Figure 90. System Timing Reference Points.

Figure 91 deﬁnes the timing parameters tdia and tdib which show the relationship of TDCLK to TDAT generated by

the ORSPI4 transmit interface. Values of tdia and tdib are given in Table 59.

Figure 91. SPI4.2 Transmit Timing Points with Respect to Clock Edge

Data Rate

Clock

Frequency

(DDR)

Transmit

REFCLK

Frequency

Recommended Operating Mode

500 -900 Mbps

250 - 450 MHz

62.5 - 112.5 MHz

Dynamic

500 -650 Mbps

250 - 325 MHz

62.5 - 81.25 MHz

Static

100 - 200 Mbps

50 - 100 MHz

100 - 200 MHz

Quarter-rate static mode

Source

Sink

TDAT[15:0] /

RDAT[15:0}

TCTL/RCTL

TDCLK/RDCLK

TDCLK

TDAT

(A)

Launch Edge

dia

dib

TDCLK

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